diff --git a/.infrahub.yml b/.infrahub.yml
index e02b890..f222f11 100644
--- a/.infrahub.yml
+++ b/.infrahub.yml
@@ -4,6 +4,7 @@ schemas:
 menus:
   - infrahub/menus
 objects:
+  - infrahub/objects/00-ipam-foundation.yml
   - infrahub/objects/01-foundation.yml
   - infrahub/objects/02-fabric.yml
   - infrahub/objects/03-devices.yml
diff --git a/infrahub/objects/00-ipam-foundation.yml b/infrahub/objects/00-ipam-foundation.yml
new file mode 100644
index 0000000..8165601
--- /dev/null
+++ b/infrahub/objects/00-ipam-foundation.yml
@@ -0,0 +1,53 @@
+# IPAM Foundation Objects
+# Must be loaded BEFORE 01-foundation.yml
+# Contains: device model, supernet prefixes, ASN number pool
+---
+
+# ================================================================
+# Device Model
+# ================================================================
+- kind: InfraDeviceModel
+  data:
+    name:
+      value: "7050SX3-48YC12"
+    description:
+      value: "Arista 7050SX3-48YC12 — 48x 25G SFP28 + 12x 100G QSFP100"
+    manufacturer:
+      value: "Arista"
+    host_port_count:
+      value: 48
+    fabric_port_count:
+      value: 12
+
+# ================================================================
+# Supernet Prefixes
+# ================================================================
+- kind: IpamIPPrefix
+  data:
+    prefix:
+      value: "10.0.0.0/8"
+    description:
+      value: "Infrastructure supernet — loopbacks, underlay, MLAG"
+
+- kind: IpamIPPrefix
+  data:
+    prefix:
+      value: "172.16.0.0/12"
+    description:
+      value: "Services supernet — L2/L3 VXLAN user subnets"
+
+# ================================================================
+# ASN Number Pool
+# ================================================================
+- kind: CoreNumberPool
+  data:
+    name:
+      value: "leaf-asn-pool"
+    description:
+      value: "ASN pool for leaf MLAG pairs (65001-65099)"
+    start_range:
+      value: 65001
+    end_range:
+      value: 65099
+    node: InfraAutonomousSystem
+    node_attribute: asn
diff --git a/infrahub/schemas/base.yml b/infrahub/schemas/base.yml
index 8b13f74..23ebc43 100644
--- a/infrahub/schemas/base.yml
+++ b/infrahub/schemas/base.yml
@@ -75,6 +75,18 @@ nodes:
         cardinality: many
         kind: Generic
         description: Fabrics deployed at this site
+      - name: infra_prefix
+        peer: IpamIPPrefix
+        identifier: site__infra_prefix
+        cardinality: one
+        optional: true
+        description: "Infrastructure IP prefix for this site"
+      - name: services_prefix
+        peer: IpamIPPrefix
+        identifier: site__services_prefix
+        cardinality: one
+        optional: true
+        description: "Services IP prefix for this site"
 
   # ================================================================
   # Platform
@@ -184,6 +196,11 @@ nodes:
         cardinality: one
         optional: true
         description: Fabric this device belongs to
+      - name: model
+        peer: InfraDeviceModel
+        cardinality: one
+        optional: true
+        description: Hardware device model
 
   # ================================================================
   # Interface Types (inherit from InfraInterface generic)
diff --git a/infrahub/schemas/device_model.yml b/infrahub/schemas/device_model.yml
new file mode 100644
index 0000000..ddd9780
--- /dev/null
+++ b/infrahub/schemas/device_model.yml
@@ -0,0 +1,34 @@
+# Device Model Schema for EVPN-VXLAN Fabric
+# Hardware platform definitions with port specifications
+---
+version: "1.0"
+nodes:
+  # ================================================================
+  # Device Model
+  # ================================================================
+  - name: DeviceModel
+    namespace: Infra
+    description: Hardware device model with port specifications
+    label: Device Model
+    icon: mdi--chip
+    include_in_menu: false
+    human_friendly_id:
+      - name__value
+    display_label: "{{ name__value }}"
+    attributes:
+      - name: name
+        kind: Text
+        unique: true
+        description: "Model name (e.g., 7050SX3-48YC12)"
+      - name: description
+        kind: Text
+        optional: true
+      - name: manufacturer
+        kind: Text
+        description: "Manufacturer name (e.g., Arista)"
+      - name: host_port_count
+        kind: Number
+        description: "Number of host-facing ports (e.g., 48 for 25G SFP28 bank)"
+      - name: fabric_port_count
+        kind: Number
+        description: "Number of fabric ports (e.g., 12 for 100G QSFP100 bank)"
diff --git a/infrahub/schemas/extensions.yml b/infrahub/schemas/extensions.yml
index ebe647d..f42b8b7 100644
--- a/infrahub/schemas/extensions.yml
+++ b/infrahub/schemas/extensions.yml
@@ -47,6 +47,17 @@ nodes:
         kind: Text
         optional: true
         description: "Shared MAC for anycast gateway (format: xxxx.xxxx.xxxx)"
+      - name: spine_count
+        kind: Number
+        optional: true
+        description: "Number of spines (2-4)"
+      - name: leaf_pair_count
+        kind: Number
+        optional: true
+        description: "Number of MLAG leaf pairs"
+      - name: mtu
+        kind: Number
+        default_value: 9214
     relationships:
       - name: spine_asn
         peer: InfraAutonomousSystem
@@ -58,6 +69,16 @@ nodes:
         identifier: fabric__sites
         cardinality: many
         optional: true
+      - name: spine_model
+        peer: InfraDeviceModel
+        cardinality: one
+        optional: true
+        description: Hardware model used for spines
+      - name: leaf_model
+        peer: InfraDeviceModel
+        cardinality: one
+        optional: true
+        description: Hardware model used for leafs
       - name: devices
         peer: InfraDevice
         identifier: fabric__devices
diff --git a/infrahub/schemas/ipam.yml b/infrahub/schemas/ipam.yml
new file mode 100644
index 0000000..1a65c6b
--- /dev/null
+++ b/infrahub/schemas/ipam.yml
@@ -0,0 +1,29 @@
+# IPAM Schema for EVPN-VXLAN Fabric
+# IP Prefix and Address types inheriting from Infrahub builtins
+# to enable the resource manager
+---
+version: "1.0"
+nodes:
+  # ================================================================
+  # IP Prefix (inherits BuiltinIPPrefix for resource manager support)
+  # ================================================================
+  - name: IPPrefix
+    namespace: Ipam
+    inherit_from:
+      - "BuiltinIPPrefix"
+    description: "IP Prefix for hierarchical IPAM (supernets, site prefixes, pool parents)"
+    label: IP Prefix
+    icon: mdi--ip-network-outline
+    include_in_menu: false
+
+  # ================================================================
+  # IP Address (inherits BuiltinIPAddress for resource manager support)
+  # ================================================================
+  - name: IPAddress
+    namespace: Ipam
+    inherit_from:
+      - "BuiltinIPAddress"
+    description: "IP Address managed by resource pools"
+    label: IP Address
+    icon: mdi--ip-network
+    include_in_menu: false